[Fuchsia] Enable the NetworkService by default.

WebEngine appears to work correctly with NetworkService enabled, so
enable it.

Bug: 964161, b/130731732
Change-Id: I0a0566690a08a854553f2a526c4350cb9aa3be9a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1613884
Commit-Queue: Wez <wez@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#661146}
4 files changed